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Idaho State Department of Agriculture (Isda) Division of Plant Industries

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Idaho State Department of Agriculture (Isda) Division of Plant Industries IDAHO STATE DEPARTMENT OF AGRICULTURE (ISDA) DIVISION OF PLANT INDUSTRIES 2013 SUMMARIES OF PLANT PESTS, INVASIVE SPECIES, NOXIOUS WEEDS, PLANT LAB, NURSERY AND FIELD INSPECTION PROGRAMS, WITH SURVEY RESULTS INTRODUCTION ISDA’s Division of Plant Industries derives its statutory authority from multiple sections of Idaho Code, Title 22, including the Plant Pest Act, the Noxious Weed Law, the Nursery and Florist Law, and the Invasive Species Act. These laws give the Division of Plant Industries clear directives to conduct pest surveys and manage invasive species and plant pests for the purpose of protecting Idaho’s agricultural industries, valued at over $4 billion, which include crops, nursery, and ranching. The Division of Plant Industries also cooperates with other agencies, including the Idaho Department of Lands (IDL), the University of Idaho (UI), the United States Forest Service (USFS), the United States Department of Agriculture (USDA), Animal and Plant Health Inspection Services (APHIS), Plant Protection and Quarantine (PPQ), county governments, Cooperative Weed Management Areas (CWMA), industry groups and other stakeholders to protect Idaho’s landscapes and environments from invasive species. Finally, the Division of Plant Industries helps accomplish the ISDA’s broader mission to serve consumers and agriculture by safeguarding the public, plants, animals and the environment through education and regulation. This report summarizes the comprehensive and cooperative programs conducted during 2013 to enforce Idaho statutes and fulfill the mission of ISDA. PEST SURVEYS APPLE MAGGOT (AM) (Rhagoletis pomonella (Walsh)) In 1990, ISDA established by administrative rule an AM-free regulated area (the “Apple Maggot Free Zone” or AMFZ) encompassing the major apple production areas of the state. Every year, ISDA conducts an area- wide survey for AM using yellow panel traps and ammonium carbonate bait. 2013 Summary of trapping for apple maggot in Idaho County Total number of Positive Negative AM traps placed AM traps AM traps Boise 20 10 10 Boundary 14 0 14 Canyon 127 1 126 Gem 92 8 84 Owyhee 35 0 35 Payette 69 1 68 Washington 97 9 88 TOTAL 454 29 425 In 2013 454 traps were placed in commercial apple orchards and home landscape trees in Boise, Boundary, Canyon, Gem, Owyhee, Payette and Washington counties. Positive specimens were identified by the ISDA entomologist. ISDA had two new finds: 1 AM in Canyon and 1 AM in Payette County. Seven of the 9 AM traps in Washington County were located within the AMFZ, and all 8 of the positive traps in Gem County were located within the AMFZ. All AM located within the AMFZ were found on traps that had been placed in hawthorn trees or in undermanaged or neglected apple trees in non-commercial settings. Gem and Washington counties are considered partially infested and regulated under a state interior quarantine. http://adminrules.idaho.gov/rules/current/02/0608.pdf 1 During 2014, ISDA will continue to conduct detection surveys in the seven-county area. In Canyon, Gem, Payette and Washington counties, ISDA will set out supplementary detection traps around the positive locations. See page 44 of this report for a map of 2013 AM survey activity in Idaho. BROWN MARMORATED STINK BUG (BMSB) (Halyomorpha halys Stal) The Brown Marmorated Stink Bug is an invasive insect native to Asia. It was accidentally introduced near Allentown, PA in 1996 and has spread since then. In recent years BMSB has been found in Colorado, Oregon and Washington. BMSB is an agricultural pest because it feeds on a wide range of tree fruits, seed pods and vegetables including tomatoes, peppers, and corn. For homeowners it is mainly a nuisance pest as it invades houses in the winter looking for a place to overwinter. In 2012 ISDA collected a live BMSB adult from a household in Nampa, ID after a concerned homeowner reported finding it on his property. The homeowner had recently moved to Idaho from Maryland so most likely this insect “hitchhiked” to Idaho as a stowaway in household items. In July 2012, viable eggs were discovered on an outdoor ornamental plant and in October an additional live specimen was collected inside the house. In 2013 ISDA received a call from a Meridian, ID resident who believed he had caught a BMSB in his yard. An ISDA official was sent to retrieve the specimen. It was later determined that the specimen was not a BMSB and was a native stink bug. During 2013 ISDA conducted visual surveys for BMSB on corn fields in several Idaho counties. These results (all negative) are detailed in the Corn Commodity Survey section of this report. WESTERN CHERRY FRUIT FLY (WCFF) (Rhagoletis indifferens Curran) ISDA routinely conducts an annual trapping program to detect first emergence of WCFF. In 2013 WCFF adults were first observed in ISDA sentinel traps on May 23rd near Caldwell in Canyon County and on May 24th near Emmett in Gem County. The agency also tracks degree-day accumulation calculations as required by the California Department of Food and Agriculture (CDFA) to comply with their WCFF quarantine, which is aimed at states wishing to export fresh sweet cherries into or through California. To comply with the California Quarantine Permit statutes, and at the request of the Idaho Cherry Commission, commercial cherry growers were notified by mail during the week of May 28, 2013 that the 1,060 degree-day threshold had been reached, this having been established as an indicator to begin pesticide treatment for WCFF. In addition, electronic notifications were sent out with assistance from the University of Idaho Cooperative Extension Service via the PNW Pest Alert Network Web Site (http://www.pnwpestalert.net/index.php). 2009-2013: Degree-day accumulations relevant to the start of pesticide treatments for WCFF 2013 2012 2011 2010 2009 Forecast for first Site treatment Historical 1060 degree day accumulations forecast dates (recommended at 1060 degree-days) Boise June 2 May 26 June 15 June 12 June 3 Caldwell May 26 May 26 June 12 June 12 June 6 Nampa May 31 June 1 June 17 June 13 June 4 Ontario May 30 May 30 June 17 June 11 May 31 Parma June 4 May 25 June 17 June 12 June 1 Emmett June 2 June 2 June 21 N/A N/A Degree-day calculations used to decide when to begin pesticide treatments for WCFF are determined by use of a degree-day computer model from the Department of Entomology at Oregon State University. Control applications are recommended on or prior to accumulations of 1,060 degree-days according to the publication, “Orchard Pest Management”, published by the Good Fruit Grower, Yakima, WA, in 1993. SPOTTED WING DROSOPHILA (SWD) (Drosophila suzukii (Matsumura)) Spotted Wing Drosophila, an Asian vinegar fly, can damage a wide variety of soft fruits, such as berries, cherries, grapes, peaches, apricots and plums. In the US SWD was initially found in California and is fast 2 becoming a problem in the Pacific Northwest. In 2012 a homeowner in Moscow, Idaho (Latah County) reported the first SWD in Idaho on Bing cherry trees on his property. Later that year SWD was found in Nez Perce and Canyon counties. In August of 2013 SWD was detected in Payette County by extension entomologists at the University of Idaho. Although the insect is not regulated by ISDA, its discovery in the state is of concern to Idaho orchardists, grape growers and gardeners, who are encouraged to monitor for the pests by placing appropriate traps. If SWD is found, spraying or other control methods are an option. Those who suspect they’ve found SWD are encouraged to submit specimens to University of Spotted Wing Drosophila Idaho Extension offices for identification. Insect specimens and infested fruit should be preserved in alcohol and packaged in crush-proof containers. Note: Absolutely no live specimens should be sent through the mail. Visit http://www.uidaho.edu/extension to locate the nearest extension office. EUROPEAN PINE SHOOT MOTH (EPSM) (Rhyacionia bouliana Denis & Schiffermuller) The Idaho EPSM survey is conducted annually to comply with California and Montana quarantines by tracking the insect’s presence within the state. In 2013 ISDA staff placed 65 EPSM traps in nurseries and pine tree plantations throughout the 13 Idaho counties in which EPSM have, so far, never been detected. In addition, at the request of nurseries seeking phytosanitary data to allow export of nursery stock, traps were deployed and monitored in four counties where EPSM had been captured in the past. No newly confirmed infested counties were reported in 2013. Finding effective control regimes and complying with Montana and California EPSM quarantines continue to challenge this segment of the Idaho nursery industry. A map of Idaho counties historically positive for EPSM is located on page 43 of this report. ELM SEED BUG (ESB) (Arocatus melanocephalus (Fabricius)) Elm Seed Bug, which until 2012 had never been found in North America, is common in central-southern Europe. It was first detected in the US in the following Idaho counties: Ada, Canyon, Elmore, Gem, Owyhee and Payette. During 2013 ESB was confirmed in four more counties in Idaho: Bannock, Bingham, Bonneville and Twin Falls. ESB, which are related to boxelder bugs, stink bugs and other seed bugs, most likely arrived in Idaho in packing containers from Italy. The insect preferentially feeds on the seeds of elm trees, but has also been observed on seeds of other trees. ESB adults are 1/3 inch long and dark chocolate-colored with rusty red triangular markings on their backs. The insect does not damage trees or buildings, nor does it present any threat to human health. However, due to its habit of entering houses and other buildings in large numbers to escape summer heat and later to overwinter, it can be viewed as a significant nuisance to homeowners.
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